EP1510107B1 - Hochfrequenzheizvorrichtung versehen mit dampferzeugerfunktion und steuerungsverfahren durch wasserzuführung dafür - Google Patents

Hochfrequenzheizvorrichtung versehen mit dampferzeugerfunktion und steuerungsverfahren durch wasserzuführung dafür Download PDF

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Publication number
EP1510107B1
EP1510107B1 EP03701734A EP03701734A EP1510107B1 EP 1510107 B1 EP1510107 B1 EP 1510107B1 EP 03701734 A EP03701734 A EP 03701734A EP 03701734 A EP03701734 A EP 03701734A EP 1510107 B1 EP1510107 B1 EP 1510107B1
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EP
European Patent Office
Prior art keywords
water
water tank
heating apparatus
frequency heating
steam
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EP03701734A
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English (en)
French (fr)
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EP1510107A1 (de
Inventor
Masaaki Sano
Nobuhiro Ogawa
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Publication of EP1510107A1 publication Critical patent/EP1510107A1/de
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/80—Apparatus for specific applications
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/647—Aspects related to microwave heating combined with other heating techniques
    • H05B6/6473—Aspects related to microwave heating combined with other heating techniques combined with convection heating
    • H05B6/6479—Aspects related to microwave heating combined with other heating techniques combined with convection heating using steam
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields

Definitions

  • the present invention relates to a water supply controlling method of a high-frequency heating apparatus that heats an object to be heated by combining a high frequency and steam heating, and the high-frequency heating apparatus executing the water supply controlling method.
  • Various high-frequency heating apparatuses in which a steam generator is provided and which execute a heating process, supplying steam to a cooking chamber which is a high-frequency heating chamber.
  • a steam generator for supplying water to a steam generator for suitably supplying steam required for a heating process to a high-frequency heating chamber.
  • a water residual quantity sensor is provided to the water tank to detect that the water tank contains water and a transparent window is provided to the water tank to enable a user to check whether the water tank contains water or not.
  • EP-A-0 952 400 discloses an example of a high-frequency heating apparatus with steam generating function equipped with such a window and water residual quantity sensor to monitor the water level in the detachable water supply tank for the steam generator. When a low water level is detected a water supply notification is displayed on a display and a predetermined time after detection of the low level the operation of the vapor generator is prohibited.
  • the residual quantity sensor and the transparent window it can be checked by the residual quantity sensor and the transparent window whether the water tank contains water or not, however, it cannot be verified when the water was supplied to the water tank and a sanitary problem may be caused. It can be checked whether the water tank contains water or not, however, there is a problem that it cannot be judged whether the quantity of the water is enough for next cooking or not.
  • the water residual quantity sensor provided to the water tank requires adjustment and maintenance, the number of parts is also increased and the cost is increased.
  • the invention is made in view of the problems and the obj ect is to provide a water supply controlling method of a high-frequency heating apparatus and the high-frequency heating apparatus in which water supplied to a heating chamber as steam is controlled in the quantity and the quality and power can be saved.
  • a water supply controlling method comprises a step of calculating elapsed time since water was supplied to the water tank and the water tank was attached to the body of the high-frequency heating apparatus and quantity of residual water in the water tank, and a step of annunciating request for replacing water in the water tank, when the elapsed time is equal to or exceeds preset predetermined time or the quantity of residual water in the water tank is equal to or less than the preset minimum quantity of held water.
  • the water supply controlling method of the high-frequency heating apparatus As the elapsed time since water was supplied to the water tank and the water tank was attached to the body of the high-frequency heating apparatus and the quantity of residual water in the water tank are calculated, it is judged that water in the water tank is old water having a sanitary problem when the elapsed time is equal to or exceeds the preset predetermined time, it is judged that water of quantity required for a heating process is not left and request for replacing water in the water tank is noticed when the quantity of residual water in the water tank is equal to or less than the preset minimum quantity of held water, old water having a sanitary problem is prevented beforehand from being used in heating and normal heating can be prevented before hand from being not executed due to the shortage of water in the heating process. Therefore, water supplied to the heating chamber can be controlled in the quantity and the quality.
  • the water supply controlling method of a high-frequency heating apparatus is characterized in that the quantity of residual water in the water tank is equivalent to quantity acquired by subtracting the quantity of water already supplied to the steam generator from the capacity of the whole water tank and the already supplied quantity is equivalent to the product of the cumulative frequency of drives of the pump for intermittently discharging water of fixed quantity and the quantity of discharged water per one drive of the pump.
  • the quantity of residual water in the water tank can be easily calculated by subtracting the product of the cumulative frequency of drives of the pump and the quantity of discharged water per one drive of the pump from the capacity of the whole water tank.
  • a water supply controlling method of a high-frequency heating apparatus is characterized in that the preset minimum quantity of held water is the minimum quantity of water supplied to the steam generator for acquiring a steam amount required for one heating process for a heated object.
  • the water supply controlling method of the high-frequency heating apparatus as the quantity of water used for future heating is adopted for the minimum quantity of held water, a situation that water is short during a heating process can be avoided beforehand.
  • a water supply controlling method of a high-frequency heating apparatus is characterized in that the annunciation is made before an object to be heated is heated.
  • a high-frequency heating apparatus comprises: a high frequency generator that supplies a high frequency to a heating chamber for housing a heated object; a steam generator that supplies steam to the heating chamber; a pump that supplies water to the steam generator; a water tank as a source of water supplied to the pump, which is detachably attached to the body of the high-frequency heating apparatus; a water tank detector that detects whether the water tank is attached to or detached from the body of the high-frequency heating apparatus; a timer that counts elapsed time since the water tank detector detected the installation of the water tank; a memory that stores the information of the quantity of water already supplied to the steam generator by the pump; annunciating means that annunciates request for replacing water in the water tank; and a controller that makes annunciation by the annunciating means executed when it is judged that elapsed time counted by the timer is equal to or exceeds preset predetermined time or the quantity of residual water in the water tank based upon the information of the already
  • the controller judges that water in the water tank is old water having a sanitary problem when the elapsed time is equal to or exceeds the preset predetermined time, judges that water of quantity required for heating is not left when the quantity of residual water in the water tank is equal to or less than the preset minimum quantity of held water and makes request for replacing water in the water tank annunciated, the old water having a sanitary problem is prevented beforehand from being used in a heating process and a normal heating process can be prevented beforehand from being not executed due to the shortage of water during heating. Therefore, water supplied to the heating chamber can be controlled in the quantity and the quality.
  • a high-frequency heating apparatus is characterized in that the pump intermittently discharges water of fixed quantity and the information of the already supplied quantity is equivalent to the frequency of drives of the pump.
  • the quantity of already supplied water can be easily calculated by counting the frequency of drives of the pump.
  • a high-frequency heating apparatus is characterized in that when the water tank detector detects the installation of the water tank, the count of the timer and the information of already supplied quantity stored in the memory are reset.
  • the timer and the memory are reset when the water tank detector detects that the water tank is newly installed, elapsed time and already supplied quantity are measured from this time.
  • a high-frequency heating apparatus is characterized in that the annunciating means annunciates by display on a display panel provided to the body of the high-frequency heating apparatus.
  • the high-frequency heating apparatus as annunciation is made using the display panel provided to the high-frequency heating apparatus, a user who operates for input on an operator panel can easily verify the contents of the annunciation and can securely recognize the contents of the annunciation.
  • the annunciating means is not required to be separately provided and the increase of the cost for annunciation can be avoided.
  • a high-frequency heating apparatus is characterized in that an auxiliary control circuit in which at least the timer is mounted and a main control circuit that controls heating in the high-frequency heating apparatus are formed as separate circuits each power source of which is independent and the auxiliary control circuit is always energized independent of whether the main control circuit is energized or not.
  • the timer required to be always energized is mounted in the auxiliary control circuit which is a low-power circuit and is disconnected from the main control circuit which executes a heating process. Therefore, even if a power source of the main control circuit is turned off, elapsed time since the water tank was installed can be monitored.
  • a high-frequency heating apparatus is characterized in that the memory is mounted in the auxiliary control circuit.
  • the memory is mounted in the auxiliary control circuit, the information of already supplied quantity from the water tank can be monitored even if the power source of the main control circuit is turned off.
  • a high-frequency heating apparatus is characterized in that the auxiliary control circuit is a low-power circuit the power consumption of which is 50 mW or less.
  • the high-frequency heating apparatus standby power in the whole high-frequency heating apparatus in case the power source of the main control circuit is turned off can be regarded as zero and the high effect of power saving can be acquired.
  • Fig. 1 is a front view showing a state in which an/a opening/closing door of the high-frequency heating apparatus according to the invention is open
  • Fig. 2 is a perspective view showing an evaporation pan of a steam generator used in this apparatus
  • Fig. 3 is a perspective view showing an evaporation pan heater and a reflector of the steam generator
  • Fig. 4 is a sectional view showing the steam generator.
  • the high-frequency heating apparatus 100 provided with a steam generating function is a cooking device that supplies at least either a high frequency (microwave) or steam to a heating chamber 11 for housing an obj ect to be heated and heats the obj ect to be heated.
  • the high-frequency heating apparatus described above is provided with a magnetron 13 that generates a high frequency as a high frequency generator, a steam generator 15 that generates steam in the heating chamber 11, a circulating fan 17 that agitates and circulates air in the heating chamber 11, a convection heater 19 that heats air circulated in the heating chamber 11 as an indoor air heater, an infrared ray sensor 20 that detects temperature in the heating chamber 11 via holes for detection provided on the wall of the heating chamber 11 and a water tank 43 for supplying water to the steam generator 15.
  • the heating chamber 11 is formed inside the box-type body . 10 the front of which is open of the high-frequency heating apparatus and an/a opening/closing door 21 provided with a light transmission window 21a for opening or closing a heated object hatch of the heating chamber 11 is provided to the front of the body 10 of the high-frequency heating apparatus.
  • the opening/closing door 21 can be opened or closed by connecting the lower end to a lower edge of the body 10 of the high-frequency heating apparatus via a hinge.
  • Predetermined heat insulating space is secured between the heating chamber 11 and a wall of the body 10 of the high-frequency heating apparatus and heat insulating material is filled in the space if necessary.
  • Space at the back of the heating chamber 11 functions as a circulating fan chamber 25 in which the circulating fan 17 and a motor 23 for driving it (see Fig. 10) are housed and the rear wall of the heating chamber 11 functions as a diaphragm 27 that partitions the heating chamber 11 and the circulating fan chamber 25.
  • a ventilating hole for an intake 29 for intake from the side of the heating chamber 11 to the side of the circulating fan chamber 25 and a ventilating hole for a blast 31 for blast from the side of the circulating fan chamber 25 to the side of the heating chamber 11 are provided in different areas of the diaphragm 27.
  • Each ventilating hole 29, 31 is formed as multiple punched holes.
  • the circulating fan 17 is arranged with the center of the rotation in the center of the rectangular diaphragm 27 and in the circulating fan chamber 25, the rectangular ring-shaped convection heater 19 is provided so that the convection heater surrounds the circulating fan 17.
  • the ventilating holes for an intake 29 formed on the diaphragm 27 are arranged before the circulating fan 17 and the ventilating holes for a blast 31 are arranged along the rectangular ring-shaped convection heater 19.
  • the circulating fan 17 As the circulating fan 17 is set so that wind flows from the front side of the circulating fan 17 to the rear side on which the driving motor 23 is located when the circulating fan 17 is turned, air in the heating chamber 11 is drawn in the center of the circulating fan 17 via the ventilating hole for an intake 29, passes the convectionheater 19 in the circulating fan chamber 25 and is sent into the heating chamber 11 via the ventilating hole for a blast 31. Therefore, air in the heating chamber 11 is circulated via the circulating fan chamber 25 by this flow, being agitated.
  • the magnetron 13 is arranged in space under the heating chamber 11 for example and a stirrer vane 33 is provided to a position for receiving a high frequency generated by the magnetron.
  • a high frequency radiated on the stirrer vane 33 from the magnetron 13 is supplied by turning the stirrer vane 33, being agitated in the heating chamber 11.
  • the magnetron 13 and the stirrer vane 33 are not only provided at the bottom of the heating chamber 11 but may be also provided on the upper surface and on the side of the heating chamber 11.
  • the steam generator 15 is composed of an evaporation pan 35 having a water reservoir concave portion 35a for generating steam by heating, an evaporation pan heater 37 arranged under the evaporation pan 35 for heating the evaporation pan 35 as shown in Figs. 3 and 4 and a reflector 39 the cross section of which is substantially U type that reflects heat radiated from the heater toward the evaporation pan 35 as shown in Fig. 2.
  • the evaporation pan 35 is made of a stainless elongated plate for example, is arranged at the bottom of the inside on the reverse side to the heated object hatch of the heating chamber 11 with the longitudinal direction along the diaphragm 27 and is provided outside a range of a temperature detection scan by the infrared ray sensor 20.
  • a glass tube heater, a sheathed heater and a plate heater can be utilized.
  • Fig. 5 is an explanatory drawing showing a state in which a water tank is housed on the side of the high-frequency heating apparatus
  • Fig. 6 is a side view showing the high-frequency heating apparatus.
  • a lid for a water tank 41 is provided to the side wall 10a of the body 10 of the high-frequency heating apparatus so that the lid can be opened and a water tank 43 for supplying water to the steam generator 15 is housed in the internal space 10b of the side wall 10a so that the water tank can be detached.
  • the water tank 43 is provided with the thin rectangular body 45 the upper part of which is open and a cap 47 attached to an opening of the body 45 so that the cap can be detached.
  • An intake pipe fitting 49 is provided to the cap 47 and an intake pipe 51 piercing the cap 47 and extended up to the vicinity of the bottom 45a of the body 45 is provided under the intake pipe fitting 49.
  • a connecting pipe 53 is protruded from the rear (ahead in a direction in which the water tank is inserted in Fig. 5) of the intake pipe fitting 49.
  • a pump 55 that intermittently discharges water of fixed quantity is provided in the internal space 10b of the side wall 10a of the body 10 of the high-frequency heating apparatus, and a pipe on the intake side 55a and a pipe on the supply side 55b are connected to the pump 55.
  • the end on the reverse side to the side of the pump 55 of the pipe on the intake side 55a is connected to a joint 56 to which the end of the connecting pipe 53 of the water tank 43 is connected so that the connecting pipe can be detached when the water tank 43 is housed in the body 10 of the high-frequency heating apparatus.
  • the pipe on the supply side 55b is connected to the evaporation pan 35 of the steam generator 15 via a pipe 57.
  • a water tank detector 59 for detecting the water tank 43 is provided above the intake pipe fitting 49 of the water tank 43 in the internal space 10b of the side wall 10a and detects whether the water tank 43 is housed or not.
  • a microswitch can be used for the water tank detector 59.
  • An input operator panel 61 and a display 63 are provided in a lower part of the opening/closing door 21 on the front side of the high-frequency heating apparatus 100 as a part of the opening/closing door of the high-frequency heating apparatus 100 is shown in Fig. 7.
  • a start switch 65 for instructing the start of cooking a manual steam switch 67 for turning on/off steam manually, an automatic steam switch 69 for turning on/off steam automatically and an automatic menu switch 71 for initiating a prepared program are provided.
  • a water supply/drainage lamp 73 as annunciating means and a display panel 75 are provided. Though the following function is not shown, a function for giving voice and an alarm may be also provided.
  • Fig. 8 is a control block diagram of the high-frequency heating apparatus.
  • a control system is mainly composed of a main control circuit 77 and an auxiliary control circuit 79.
  • the main control circuit 77 is mainly composed of a main controller 81 provided with a microprocessor for example and the main controller 81 turns on/off a main power source 85a connected to a power supply line 85 via a main switch 83.
  • the main control circuit 77 controls an operating unit 87, a heating unit 89, the input operator panel 61 and the display 63.
  • the high frequency generator 13, the steam generator 15, the circulating fan 17 and the infrared ray sensor 20 are connected to the heatingunit 89, the high frequency generator 13 is operated in cooperation with the radio wave agitator (a drive unit of the stirrer vane) 33, and the evaporation pan heater 37, the indoor air heater 19 (the convection heater) and the pump 55 are connected to the steam generator 15.
  • the radio wave agitator a drive unit of the stirrer vane
  • the evaporation pan heater 37, the indoor air heater 19 (the convection heater) and the pump 55 are connected to the steam generator 15.
  • the start switch 65, the manual steam switch 67, the automatic steam switch 69 and the automatic menu switch 71 for starting programmed automatic cooking are connected to the input operator panel 61, and the water supply/drainage lamp 73 and the display panel 75 are connected to the display (the annunciating means) 63.
  • the auxiliary control circuit 79 is a low-power microcomputer circuit the power consumption of which is 50 mW or less and even if the main power source 85a of the main control circuit 77 is turned off, the auxiliary control circuit is always energized. In view of the power consumption of the auxiliary control circuit 79, the standby power can be regarded as substantially zero.
  • the auxiliary control circuit 79 is mainly composed of a deputy controller 91 provided with a microprocessor for example and connected to the main controller 81. Power is always supplied to the deputy controller 91 via a deputy power source 85b from the power supply line 85 and the deputy controller controls a memory 93, a timer 95 and the water tank detector 59.
  • the deputy controller 91 As the deputy power source of the deputy controller 91 is always connected, the deputy controller always monitors a state of the water tank detector 59.
  • the timer 95 and the memory 93 can be reset even if the main power source 85a is turned off.
  • the memory 93 is a non-volatile memory so that the contents are also stored in service interruption for example, however, the memory may be also a volatile memory to form it at a low price.
  • a heated object such as a food to be heated is laid on a dish, the dish is put in the heating chamber 11 and the opening/closing door 21 is closed.
  • a heating method and heated temperature or heating time are set on the input operator panel 61 (a step 100, hereinafter abbreviated as S100) and the start switch 65 is turned on (S101). Then, heating is automatically made based upon a heating condition input by the control operation of the main controller 81 (S102).
  • the main controller 81 reads set heated temperature and heating time, selects and executes an optimum cooking method based upon them, judges whether the current temperature and time reach the set heated temperature and heating time or not (S103), stops each heating source and terminates heating when the current values reach the set values (S104).
  • S102 the generation of steam, the operation of the indoor air heater, the turning of the circulating fan andhigh-frequency heating are individually or simultaneously made.
  • the evaporation pan heater 37 is turned on as shown in an explanatory drawing showing the operation of the high-frequency heating apparatus 100 in Fig. 10, as a result, water supplied from the water tank 43 by the pump 55 in the evaporation pan 35 is heated and steam S is generated.
  • the blown steam is agitated in the heating chamber 11 and is sucked again from the ventilating hole for an intake 29 substantially in the center of the diaphragm 27 to the side of the circulating fan chamber 25.
  • a circulating path is formed between the heating chamber 11 and the circulating fan chamber 25.
  • No ventilating hole for a blast 31 is provided under a position in which the circulating fan 17 is arranged of the diaphragm 27 so that generated steam is led to the ventilating hole for an intake 29. Therefore, as shown by a void arrow in Fig. 10, steam is circulated in the heating chamber 11 and is efficiently blown on a heated object M.
  • the temperature of steam circulated in the heating chamber 11 can be also set to high temperature. Therefore, so-called superheated steam is acquired and cooking for grilling the surface of the heatedobject M is also enabled.
  • high-frequency heating a high frequency is supplied, being agitated in the heating chamber 11 by turning on the magnetron 13 and turning the stirrer vane 33 and high-frequency heating in which steam and a high frequency are combined is enabled.
  • Fig. 11 is a flowchart showing a procedure for a water supply controlling method equivalent to this embodiment.
  • the water supply controlling method of the high-frequency heating apparatus 100 is characterized in that before the steam heating (hereinafter also called steam cooking) is started, a state of water in the water tank 43 is judged and it is annunciated if necessary that water should be drained from the water tank 43 or water should be supplied to the water tank.
  • steam heating hereinafter also called steam cooking
  • elapsed time detected by the water tank detector 59 since the water tank was attached to the body 10 of the high-frequency heating apparatus is read from the timer 95 as the latest information of the currently installed water tank 43.
  • the cumulative frequencyof the drives of the pump 55 since the water tank detector 59 detected the installation of the water tank 43 is read from the memory 93 (S202).
  • the quantity of water already supplied from the water tank 43 as latest information is calculated by multiplying the quantity of discharged water per one drive of the pump 55 by the cumulative frequency of drives. That is, the already supplied quantitymeans the quantity of water already supplied to the steam generator 15 after the water tank 43 is attached to the body 10 of the high-frequency heating apparatus in a full state.
  • the main controller 81 compares the acquired current quantity of residual water in the water tank 43 with the preset minimum quantity of held water (S204).
  • the minimum quantity of held water means the minimum quantity of water supplied to the steam generator to acquire the quantity of steam required for one heating of a heated obj ect. In case the acquired current quantity of residual water is equal to or less than the minimum quantity of held water, water is short in steam cooking, heating is stopped and cooking fails.
  • the main controller 81 judges that the quantity of residual water is short, the replacement of water in the water tank 43 is requested by the water supply/drainage lamp 73 and the display panel 75 as annunciating means (S205) .
  • the main controller 81 judges that the quantity of residual water is more than the minimum quantity of held water, it is judged whether elapsed time shown by the timer 95 since the water tank 43 was installed exceeds predetermined time or not (S206). In case it is judged that the elapsed time exceeds the predetermined time, it is judged that water in the water tank 43 is old water which has a sanitary problem and in S205, annunciation that requests the replacement of water in the water tank 43 is made.
  • the predetermined time means time to an extent that water housed in the water tank does not have a sanitary problem. Naturally, it is a principle to replace water in the water tank every cooking, however, assuming that replaced water can be used within 24 hours for example after the replacement of water particularly without difficulties, predetermined time is set to 24 hours in that case.
  • a user When request for replacing water in the water tank 43 is annunciated, a user extracts the water tank 43 form the body 10 of the high-frequency heating apparatus, drains the water tank 43 of water and fully supplies new water.
  • the water tank 43 is attached to the body 10 of the high-frequency heating apparatus again (S207).
  • the water tank detector 59 detects the installation of the water tank 43 and the deputy controller 91 resets the timer 95 and the memory 93 (S208).
  • the timer 95 initiates new count (counting time) since the installation was detected (S209). After the timer 95 initiates count, steam cooking is started (S210).
  • the pump 55 When steam cooking is started, the pump 55 is driven by a frequency required for supplying steam and water in the water tank 43 is intermittently supplied to the steam generator 15 (S211). A frequency in which the pump 55 is driven is counted according to the operation for supply (S212) and the cumulative frequency of drives is stored in the memory 93 (S213). As described above, steam cooking is completed, grasping the quantity of supplied water (S214).
  • the quantity which can be supplied to the steam generator 15 of residual water in the water tank 43 is calculated in case steam cooking is selected for a type of heating and it is annunciated that water in the water tank 43 should be replaced in case the quantity of residual water is less than the predetermined minimum quantity of held water, steam cooking in which steam is supplied can be normally executed without being interrupted due to the shortage of water. Further, even if the quantity of residual water in the water tank 43 is equal to or more than the minimum quantity of held water, old water can be prevented from being used for cooking by monitoring elapsed time since water was last supplied to the water tank 43. Hereby, sanitary steam cooking is enabled.
  • the auxiliary control circuit 79 can receive power even if the main power source 85a of the main control circuit 77 is turned off. Hereby, power for monitoring the water tank 43 can be minimized and power can be saved.
  • the quantity of residual water in the water tank 43 is judged, the quantity of residual water is calculated by subtracting a value acquired by multiplying the cumulative frequency of the drives of the pump 55 by discharged quantity per one drive from the full capacity of the water tank 43, and it is judged depending upon whether the quantity of the residual water is more than the minimum quantity of held water or not whether water in the water tank should be replaced or not, however, in place of this, the cumulative frequency of the drives of the pump 55 may be also only compared with a preset allowable frequency of drives.
  • a frequency of drives close to a frequency equivalent to the full capacity of the water tank 43 is preset as an allowable frequency of drives, in case the cumulative frequency of drives does not reach the allowable frequency of drives, it is judged that the quantity of residual water is enough and though the method is simple, the quantity of residual water can be judged.
  • an excessive numeric value for example may have only to be input to the memory 93 as a cumulative frequency of drives.
  • an excessive value such as 500 is input.
  • the cumulative frequency of drives is larger than the allowable frequency of drives and the replacement of water is securely requested by the annunciating means.
  • Fig. 12 is a flowchart showing the different part from the procedure for control in the first embodiment.
  • the concrete procedure for control in this embodiment is as follows. That is, after S201 to S203 are finished, the automatic menu switch 71 is pressed and the contents of desired steam cooking are selected (S301). The quantity of water required according to the selected contents of steam cooking is estimated (S302). Referring to the result of calculating the current quantity of residual water in the water tank 43 in S203, the calculated quantity of required water and the quantity of residual water in the water tank 43 are compared (S303).
  • the quantity of water required for cooking is not only calculated by a mathematical expression such as an empirical expression but a database related to the contents of cooking and required quantity of water is prepared beforehand and the quantity of water required for cooking may be also acquired from the database.
  • the configuration of the control system of the high-frequency heating apparatus in each embodiment is not limited to the configuration mainly composed of the main control circuit 77 and the auxiliary control circuit 79 shown in Fig. 8 and may be also varied as follows. That is, as shown in a control block diagram showing another control system in Fig. 13, a memory 93 may be also provided to the side of a main control circuit 78. As the supply of power from a main power source 85a to the memory 93 is disconnected, a non-volatile memory is used for the memory 93 in this case.
  • the control of water in a water tank over elapsed time can be executed as described above.
  • the deputy controller 91 notifies a main controller that the water tank is attached/detached when the main power source 85a is turned on next.
  • the main controller 81 receives this notice and resets the memory 93.
  • the memory 93 may also be connected to either the main controller 81 or the deputy controller 91 and inboth cases, the operation described in the first embodiment can be realized.
  • An auxiliary control circuit 80 formed separately from the main control circuit 78 can be composed at a low price by limiting the function of the auxiliary control circuit 80 to the necessary and minimum function, the cost of the whole apparatus can be reduced and power can be saved.
  • the high-frequency heating apparatus according to the invention is not limited to each embodiment described above and may be suitably transformed and improved in a range which does not deviate from the object and the outline of the invention.
  • the water supply controlling method of the high-frequency heating apparatus and the high-frequency heating apparatus As described above, according to the water supply controlling method of the high-frequency heating apparatus and the high-frequency heating apparatus according to the invention, as the quantity of residual water supplied to the steam generator in the water tank is estimated when steam cooking is selected and request for replacing water in the water tank is annunciated in case the quantity of residual water is less than the predetermined minimum quantity of held water, also in case elapsed time since water was last supplied to the water tank exceeds the predetermined time and further, in case the quantity of required water used for heating is calculated and the quantity of residual water in the water tank is less than the required quantity, steam cooking in which steam is supplied can be executed without the shortage of water, old water is prevented from being used for cooking and sanitary steam cooking is enabled. Therefore, water supplied to the heating chamber as steam can be controlled both in quantity and quality.
  • the power source of which is formed independent of the power source of the main control circuit and which is always energized, power can be saved.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)

Claims (11)

  1. Verfahren zum Steuern von Wasserzufuhr in einer Hochfrequenz-Erwärmungsvorrichtung mit Dampferzeugungsfunktion, die einen Wasserbehälter (43), der an einem Körper (10) der Hochfrequenz-Erwärmungsvorrichtung (100) so angebracht ist, dass der Wasserbehälter (43) abgenommen werden kann, und eine Pumpe (55) zum Zuführen von Wasser zu einem Dampferzeuger (15) aus dem Wasserbehälter (43) umfasst, wobei der Dampferzeuger (15) einer Erwärmungskammer (11) zum Aufnehmen eines erwärmten Objektes (M) wenigstens Dampf zuführt und das erwärmte Objekt (M) erwärmt, und Wasser in dem Wasserbehälter (43) überwacht wird, und das Verfahren die folgenden Schritte umfasst:
    Berechnen einer Zeit, die verstrichen ist, seit dem Wasserbehälter (43) Wasser zugeführt wurde und der Wasserbehälter (43) an dem Körper (10) der Hochfrequenz-Erwärmungsvorrichtung (100) angebracht wurde, und einer Menge an Restwasser in dem Wasserbehälter (43); und
    Ankündigen einer Anforderung zum Austauschen von Wasser in dem Wasserbehälter (43), wenn die verstrichene Zeit einer voreingestellten Zeit entspricht oder diese überschreitet oder die Menge an Restwasser in dem Wasserbehälter (43) der voreingestellten minimalen Menge an aufgenommenem Wasser entspricht oder geringer ist als diese.
  2. Wasserzuführ-Steuerverfahren nach Anspruch 1, wobei die Menge an Restwasser in dem Wasserbehälter (43) äquivalent zu der Menge ist, die bestimmt wird, indem die dem Dampferzeuger (15) bereits zugeführte Menge an Wasser von dem Fassungsvermögen des gesamten Wasserbehälters (43) subtrahiert wird; und
    die bereits zugeführte Menge äquivalent zu dem Produkt der kumulativen Häufigkeit von Antriebsvorgängen der Pumpe (55) zum intermittierenden Abgeben von Wasser einer unveränderlichen Menge und der pro Antriebsvorgang der Pumpe (55) abgegebenen Menge an Wasser ist.
  3. Wasserzuführ-Steuerverfahren nach Anspruch 1, wobei die voreingestellte minimale Menge an aufgenommenem Wasser äquivalent zu der minimalen Menge an Wasser ist, die dem Dampferzeuger (15) zugeführt wird, um eine Dampfmenge zu gewinnen, die zum einmaligen Erwärmen eines erwärmten Objektes (M) erforderlich ist.
  4. Wasserzuführ-Steuerverfahren nach Anspruch 1, wobei die Ankündigung erfolgt, bevor das erwärmte Objekt (M) erwärmt wird.
  5. Hochfrequenz-Erwärmungsvorrichtung (100) mit Dampferzeugungsfunktion, die umfasst:
    einen Hochfrequenzgenerator (13), der einer Erwärmungskammer (11) zum Aufnehmen eines erwärmten Objektes (M) eine Hochfrequenz zuführt;
    einen Dampferzeuger (15), der der Erwärmungskammer (11) Dampf zuführt;
    eine Pumpe (55), die dem Dampferzeuger (15) Wasser zuführt;
    einen Wasserbehälter (43) als eine Quelle von Wasser, das der Pumpe (55) zugeführt wird, der abnehmbar an dem Körper (10) der Hochfrequenz-Erwärmungsvorrichtung (100) angebracht ist,
    gekennzeichnet durch:
    einen Wasserbehälter-Detektor (59), der erfasst, ob der Wasserbehälter (43) an dem Körper (10) der Hochfrequenz-Erwärmungsvorrichtung (100) angebracht oder von ihm abgenommen ist;
    ein Zeitglied (95), das Zeit zählt, die verstrichen ist, seit der Wasserbehälter-Detektor (59) die Installation des Wasserbehälters (43) erfasst hat;
    einen Speicher (93), der die Informationen über die Menge an Wasser speichert, die dem Dampferzeuger (15) bereits durch die Pumpe (55) zugeführt worden ist; eine Ankündigungseinrichtung (63), die eine Anforderung zum Austauschen des Wassers in dem Wasserbehälter (43) ankündigt; und
    eine Steuereinheit (81), die Ankündigung durch die Ankündigungseinrichtung (63) ausführen lässt, wenn festgestellt wird, dass die durch das Zeitglied (95) gezählte verstrichene Zeit einer voreingestellten vorgegebenen Zeit entspricht oder diese überschreitet oder die Menge an Restwasser in dem Wasserbehälter (43) auf Basis der Informationen über die bereits zugeführte Menge, die in dem Speicher (93) gespeichert sind, der voreingestellten minimalen Menge an aufgenommenem Wasser entspricht oder geringer ist als diese.
  6. Hochfrequenz-Erwärmungsvorrichtung mit Dampferzeugungsfunktion nach Anspruch 5, wobei die Pumpe (55) intermittierend Wasser einer unveränderlichen Menge abgibt und die Informationen über die bereits zugeführte Menge die Häufigkeit von Antriebsvorgängen der Pumpe (55) sind.
  7. Hochfrequenz-Erwärmungsvorrichtung mit Dampferzeugungsfunktion nach Anspruch 5, wobei, wenn der Wasserbehälter-Detektor (59) die Installation des Wasserbehälters (43) erfasst, der Zählwert des Zeitgliedes (95) und die Informationen über die bereits zugeführte Menge, die in dem Speicher (93) gespeichert sind, zurückgesetzt werden.
  8. Hochfrequenz-Erwärmungsvorrichtung mit Dampferzeugungsfunktion nach Anspruch 5, wobei die Ankündigungseinrichtung (63) durch Anzeige auf einem Anzeigefeld (75) ankündigt, das an dem Körper (10) der Hochfrequenz-Erwärmungsvorrichtung (100) vorhanden ist.
  9. Hochfrequenz-Erwärmungsvorrichtung mit Dampferzeugungsfunktion nach Anspruch 5,
    wobei eine Zusatz-Steuerschaltung (79), in der wenigstens das Zeitglied (95) angebracht ist, und eine Hauptsteuerschaltung (77), die Erwärmen in der Hochfrequenz-Erwärmungsvorrichtung (100) steuert, als separate Schaltungen ausgebildet sind, deren Energiequellen (85a, 85b) jeweils unabhängig sind; und
    an die Zusatz-Steuerschaltung (79) unabhängig davon, ob an die Hauptsteuerschaltung (77) Spannung angelegt wird oder nicht, stets Spannung angelegt wird.
  10. Hochfrequenz-Erwärmungsvorrichtung mit Dampferzeugungsfunktion nach Anspruch 9, wobei der Speicher (93) in der Zusatz-Steuerschaltung (79) angebracht ist.
  11. Hochfrequenz-Erwärmungsvorrichtung mit Dampferzeugungsfunktion nach Anspruch 9, wobei die Zusatz-Steuerschaltung (79) eine Niedrigleistungsschaltung ist, deren Leistungsaufnahme 50 mW oder weniger beträgt.
EP03701734A 2002-06-05 2003-01-15 Hochfrequenzheizvorrichtung versehen mit dampferzeugerfunktion und steuerungsverfahren durch wasserzuführung dafür Expired - Lifetime EP1510107B1 (de)

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JP2002164837 2002-06-05
JP2002164837A JP3731816B2 (ja) 2002-06-05 2002-06-05 高周波加熱装置の給水制御方法及び高周波加熱装置
PCT/JP2003/000281 WO2003105536A1 (en) 2002-06-05 2003-01-15 High-frequency heating apparatus with steam generating function and water supply controlling method therefor

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EP1510107B1 true EP1510107B1 (de) 2006-07-26

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JP2004011995A (ja) 2004-01-15
WO2003105536A1 (en) 2003-12-18
JP3731816B2 (ja) 2006-01-05
US6956190B2 (en) 2005-10-18
DE60307098D1 (de) 2006-09-07
KR20050010023A (ko) 2005-01-26
AU2003203230A1 (en) 2003-12-22
US20050145622A1 (en) 2005-07-07
DE60307098T2 (de) 2006-11-23
ATE334569T1 (de) 2006-08-15
CN100456895C (zh) 2009-01-28
EP1510107A1 (de) 2005-03-02

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